linux-kernel - Re: [PATCH net-next v4 1/2] dt-bindings: net: dsa: lantiq,gswip: add MaxLinear R(G)MII slew rate

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Message-ID: <20260113164128.GA3919887-robh@kernel.org>
Date: Tue, 13 Jan 2026 10:41:28 -0600
From: Rob Herring <robh@...nel.org>
To: "A. Sverdlin" <alexander.sverdlin@...mens.com>
Cc: netdev@...r.kernel.org, Hauke Mehrtens <hauke@...ke-m.de>,
	Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Daniel Golle <daniel@...rotopia.org>
Subject: Re: [PATCH net-next v4 1/2] dt-bindings: net: dsa: lantiq,gswip: add
 MaxLinear R(G)MII slew rate

On Wed, Jan 07, 2026 at 10:00:16AM +0100, A. Sverdlin wrote:
> From: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> 
> Add new maxlinear,slew-rate-txc and maxlinear,slew-rate-txd uint32
> properties. The properties are only applicable for ports in R(G)MII mode
> and allow for slew rate reduction in comparison to "normal" default
> configuration with the purpose to reduce radiated emissions.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> ---
> Changelog:
> v4:
> - separate properties for TXD and TXC pads ("maxlinear," prefix re-appears)
> v3:
> - use [pinctrl] standard "slew-rate" property as suggested by Rob
>   https://lore.kernel.org/all/20251219204324.GA3881969-robh@kernel.org/
> v2:
> - unchanged
> 
>  .../devicetree/bindings/net/dsa/lantiq,gswip.yaml  | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> index 205b683849a53..747106810cc17 100644
> --- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
> @@ -106,6 +106,20 @@ patternProperties:
>          unevaluatedProperties: false
>  
>          properties:
> +          maxlinear,slew-rate-txc:
> +            $ref: /schemas/types.yaml#/definitions/uint32
> +            enum: [0, 1]

default: 0

> +            description: |
> +              RMII/RGMII TX Clock Slew Rate:

blank line
> +              0: "Normal"
> +              1: "Slow"

Indent lists by 2 more spaces. Drop the quotes.

> +          maxlinear,slew-rate-txd:
> +            $ref: /schemas/types.yaml#/definitions/uint32
> +            enum: [0, 1]
> +            description: |
> +              RMII/RGMII TX Non-Clock PAD Slew Rate:
> +              0: "Normal"
> +              1: "Slow"
>            maxlinear,rmii-refclk-out:
>              type: boolean
>              description:
> -- 
> 2.52.0
>